i have an 04.5 lly with 161k on it. when its cold and i start it up, even if i let it run for 5 to 10 minutes, i will take off easy with barely any throttle and never exceed 2k.i also put it on my low boost (lb7) tune but yet it will built 10lbs of boost with hardly any throttle. it makes this sound from under the hood that sounds exactly like a supercharger whine. once it warms up, its gone and will whistle like a normal turbo. could this be my bearings?

i have an 04.5 lly with 161k on it. when its cold and i start it up, even if i let it run for 5 to 10 minutes, i will take off easy with barely any throttle and never exceed 2k.i also put it on my low boost (lb7) tune but yet it will built 10lbs of boost with hardly any throttle. it makes this sound from under the hood that sounds exactly like a supercharger whine. once it warms up, its gone and will whistle like a normal turbo. could this be my bearings?

Usually the turbo vanes are set to be open when cold (ie makes boost easily and has a loud hissing sound) and then will close up as it warm up.....helps the engine heat up faster and is perfectly normal.

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